How to Open a DMG File in Windows

Whether you are an avid Mac programmer using a Windows PC, or you just found a DMG file on your Windows machine, it can be useful to open it up and figure out what it is.

What Are DMG Files?

DMG files are macOS disk image files. They are much like ISO files—their Windows-based counterpart.

These disk images normally contain program installation files for macOS apps, but they can also be used to hold compressed files. If it’s an app written for macOS, you obviously won’t be able to install and run the app on Windows. But, you can still open them up and take a look.

You can’t open DMG files directly in Windows, though. For that, you’ll need a third-party tool.

Open DMG Files in Windows By Using 7-Zip or DMG Extractor

There are a lot of different tools you can use to extract DMG files in Windows. Our two favorites are 7-Zip and DMG Extractor. In our testing, we found a few DMG files that would open with one of those apps but not the other. However, we found no DMG files we couldn’t get open with one of those two apps.

We recommend starting with 7-Zip because the free version of DMG extractor has some limitations—the biggest of which is only being able to extract five files at a time. If 7-Zip cannot extract your DMG file, then you should try DMG Extractor and, optionally, decide whether it’s worth buying the professional version.

Open DMG Files with 7-Zip

7-Zip is a lightweight, but powerful compression tool that is free to download. In addition to extracting DMG files, you can use 7-Zip to extract most types of compressed files out there, including ZIP, CAB, ISO, RAR, and WIM, to name just  few. It also lets you create your own compressed files in ZIP, WIM, 7z, and a few other formats.

After installing 7-Zip, you can simply double-click a DMG file to open it and browse its contents.

If you’d like to extract the files from the DMG so they’re easier to work with, right-click the DMG file, point to the “7-Zip” menu, and then choose one of the extraction options. Choose “Extract Files” to select a folder where the files are extracted, “Extract Here” to extract files to the same folder where the DMG file is, or “Extract to foldername” to create a new folder named after the DMG file and extract the files to that new folder.

The speed of the extraction depends on the size of the DMG file and the speed of your PC.

When the extraction is finished, you can browse the files in a regular File Explorer window.

You can view or edit the files using any of the regular File Explorer features or whatever apps you use.

Open DMG Files with DMG Extractor

DMG extractor provides another choice for extracting DMG files. The free version works well, but it does have some limitations:

  • You cannot extract files bigger than 4 GB
  • You cannot extract encrypted files
  • You can only extract 5 files at a time, which can be a pain if you need to extract an entire DMG file.

If you need any of the features on that list, you’ll have to purchase the professional version ($9.95). For that reason, we highly recommend trying the 7-Zip solution we outlined in the previous section and resorting to DMG Extractor only if 7-Zip cannot open a particular file.

We’re going to use the free version for this tutorial, but aside from those limitations, the professional version works the same.

After installing DMG Extractor, all you have to do is double-click your DMG file to open it up. You can browse the files right in the DMG Extractor window if you just want to see what’s inside the DMG file.

If you need to extract the file, click the “Extract” button on the toolbar, and then choose one of the extraction options. You can extract all files to the desktop or a folder of your choosing, or you can extract only files you’ve selected.

Just remember that the free version only allows you to extract five files at a time.

That is essentially all you need to know when it comes to extracting the contents of DMG files to your Windows PC. If you do not want to download these programs, one other option is to follow our guide on how to convert DMG files to ISO’s. After that conversion is done, you can mount the ISO in Windows and access the files that way.

Martin Hendrikx is a technology writer and author with years of experience. He has traveled to 47 countries and counting and is well versed in all things Windows.